No, I am commenting on another friends blog and they respond. I then attempt to reply to their response and 'no dice.' It is not working. This is occurring on the notification section, by the way. I get notified and usually respond to the notification, until now.

Mike, the same with me! I have cleared my "cache" and I have changed nothing since the last time I was able to "Reply". Whatever happened, happened in the last couple of hours! I've just posted same on the forum! Doreen